CHEMISTRY HIGH SCHOOL

A placebo is a substance that is unlikely to affect the dependent variable. a. True
b. False

Answers

Answer 1
Answer:

Answer : Option a) True.

Explanation : A placebo is a substance that is unlikely to affect the dependent variable. True as in a clinical trial for any change in the placebo arm is known as the placebo response, and the difference between this placebo response and the result of no treatment is called as the placebo effect. Therefore, a placebo may be given to any person in a clinical context in order to deceive that recipient into thinking that it is an part of active treatment. It actually resembles a drug but is not an actual active drug, so, it is clear that it will not affect dependent variable.
Answer 2
Answer: True. A placebo is a substance used to ensure that the independent variable is what is affecting the dependent variable. Usually used in drug trials

Related Questions

How many moles are in 22 grams of argon
Which statement best describes how an ionic bond forms? a.The transfer of electrons forms strong bonds between ions. b. The sharing of electrons forms strong bonds between ions. c. The transfer of electrons results in attractive forces between molecules. d.The sharing of electrons results in attractive forces between molecules.
HELP I NEED HELP ASAPHELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAP HELP I NEED HELP ASAPA. Chlorine B. SulfurC. OxygenD. None of the above
The diagram below shows the sequence of events and processes which resulted in the origin of life on Earth.Picture shows a flow chart with a rectangle labeled non-living matter at the top, an oval labeled chemical processes below it, and a rectangle labeled A at the bottom. Which of these events best fits the box labeled A? A.destruction of cells B.appearance of bacteria C.creation of primitive plants D.transformation of atmosphere
SOMEONE HELP ME PLEASEEEE!!!What is the outermost layer of the Earth called?

Given the balanced equation:I + I==> I2
Which statement describes the process represented by this equation?
(1) A bond is formed as energy is absorbed.
(2) A bond is formed and energy is released.
(3) A bond is broken as energy is absorbed.
(4) A bond is broken and energy is released.

Answers

The answer is (2) A bond is formed and energy is released. The left side of equation is I atom and the right side of equation is I2 molecule. So the bond is formed between I atom to form I2 molecule. And forming bond will release energy while breaking bond will absorb energy.

How does heat differ from temperature

Answers

Heat is the total energy of molecular motion in a substance while temperature is a measure of the average energy of molecular motion in a substance. Heat energy depends on the speed of the particles, the number of particles (the size or mass), and the type of particles in an object.
heat makes the tempruture rise

The clown fish hides inside the poisonous tentacles of the sea anemone. Since most other fish are unable to survive the anemone’s stings, the clown fish is protected from predators. In addition, it can feed on the leftovers from the anemone’s meals. This symbiotic relationship is called _____________________.A.
parasitism
B.
amensalism
C.
commensalism
D.
symbiosis

Answers

Answer: C: commensalism   please give me hearts and stars because the answer is right!!

Explanation:

The relationship between the clown fish and the deadly sea anemone can be classified as commensalism. Though the sea anemone’s tentacles are covered with thousands of nematocysts (tiny, venomous harpoons), the clown fish is protected by a thick coat of mucus and is not harmed by the anemone’s venom. The clown fish is therefore protected from predators and is also able to get leftover food from the anemone's meals. Since the clown fish ultimately benefits from this arrangement and the sea anemone neither benefits nor suffers because of the clown fish, the relationship is commensalistic.

Final answer:

The clown fish and the sea anemone exhibit a mutualistic relationship, where both organisms benefit. However, among the options provided in the question, the most accurate is 'symbiosis', which broadly denotes a close, long-term interaction between different biological species.

Explanation:

The symbiotic relationship between the clown fish and the sea anemone is referred to as mutualism. This term, which is missing from the options, indicates a relationship in which both organisms benefit. The clown fish is protected from predators and has access to food remnants, whereas the sea anemone gets cleaned by the clown fish, which removes parasites and debris. Among the options provided, the closest would be symbiosis (option D), as it describes a close, long-term interaction between different biological species, which can include mutualism, commensalism, and parasitism.

Learn more about Symbiotic Relationships here:

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Which statement best describes gamma radiation?(1) It has a mass of 1 and a charge of 1.
(2) It has a mass of 0 and a charge of –1.
(3) It has a mass of 0 and a charge of 0.
(4) It has a mass of 4 and a charge of +2.

Answers

The correct answer is option 3. The gamma radiation has no mass and no charge. This is produced from the release of pure energy from the nucleus. This is simply a stream of high frequency energy.

Sound waves entering the ear first strike the .

hammer,anvil,eardrum,cochlea

Answers

I believe it is the Eardrum, Hammer, Anvil then Cochlea. 

Which substance has the lowest vapor pressure at 75°C?(1) water (3) propanone
(2) ethanoic acid (4) ethanol

Answers

Answer : (2) Ethanoic acid has the lowest vapor pressure at 75^(0)C.

Explanation :

Vapor pressure is the pressure which is exerted by vapor when the vapor form is in equilibrium with the solid or liquid form.

Boiling point is the temperature in which the vapor pressure of liquid is equal to the atmospheric pressure.

Vapor pressure is related with the boiling point :

vapor pressure is inversely proportional to the boiling point. As the boiling point increases, vapor pressure decreases and as the boiling point decreases, vapor pressure increases.

\text{Vapor presssure }\infty \frac{1}{\text{boiling point}}

The standard boiling point of given liquids water, propanone, ethanoic acid and ethanol are 100, 56, 118 and 79^(0)C respectively.

The image of graph of vapor pressure vs temperature is attached below.

Hence,  Ethanoic acid is the substance which has the lowest vapor pressure.
Vapor pressure is a colligative property. This means that intermolecular forces play a large role in how volatile a substance is. We can thus assume that the substance and or liquid in this case with the strongest intermolecular forces will have the lowest vapor pressure, as intermolecular attraction will oppose the vaporizing forces created by temperature and or kinetic energy. The strongest of such intermolecular forces is hydrogen bonding, and given some knowledge of boiling point we can find the answer. In this case:
water: has hydrogen bonding, dispersion, and dipole forces for intermolecular attraction
ethanoic acid: a carboxylic acid has one polar end with a negative charge as CH3COOH turns to CH3COO-. Hydrogen bonding is also present in pure solutions.
Propanone: is a ketone and has an electronegative oxygen attached to a carbon, but does not exhibit hydrogen bonding since the O is not attached to a hydrogen. 
Ethanol: Like water exhibits hydrogen bonding, not as strong but more dispersion forces. 

Next we must understand boiling points
Water: 100˚C
Ethanoic Acid: 118˚C
Propanone: 56˚C
Ethanol: 78˚C
Given this knowledge we can order the liquids in terms of decreasing volatility or decreasing vapor pressure. We now notice that Ethanoic acid, or acetic acid will have the lowest vapor pressure at 75˚C
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